[dredmorbius]

This presumes that the occupants of the shelter know the address, that rescuers have cellular access (towers and other infrastructure may be down), or that the person(s) calling for help are the residents or usual occupants of the structure.

Survivors or those requesting help might not be adults or residents. They might be children, visitors, or strangers seeking shelter (particularly in the case of a business or commercial address). They might be volunteers searching for survivors. Contact might be over radio if phone service is down. GPS operates directly via satellite, so is independent of and terrestrial infrastructure.

The operating assumption of a disaster is that previous assumptions of normality are violated. Responses which remove assumptions of available serivces, or restore a bare minimal functional level of service, or which protect against likely disruptions, tend to be those that are most useful.

GPS is based on

[alphabettsy]

Navigation using an address also works without cellular otherwise Garmin and TomTom devices wouldn’t exist.

I think an address is much easier to understand for a child.

Using an uncommon for most people method of location identifier brings problems of its own. Sure Lat/Long is familiar to us, but I’d guess the average person is unfamiliar.

Like I said, I like the idea but it doesn’t come without its own problems and addresses aren’t as useless in this scenario as implied.

[dredmorbius]

Fair points. I'd still register GPS as more generally useful and usable.

[grogenaut]

your assuming they dont have both. people dont memorize their gps coords and theyre not easily findable with a phone. redundancy, defense in depth.